Resumo:
Short-term voltage variations (STVVs) are events that affect the power quality and can
cause great financial losses to industrial consumers who have loads sensitive to this
disturbance, in addition to impairing the safety and reliability of processes. ANEEL,
recognizing the importance of the matter, established through PRODIST the Impact Factor
index to quantify the performance of the buses of a distribution system from the point of view
of the STVVs. However, the base impact factor proposed in the regulation is unique, not
considering the differences that the distribution systems have in relation to the potential cause
of the event.
In this context, this thesis presents a methodology for establishing different base impact
factors for each distribution system. The work is focused on determining which variables best
describe the disturbance and from these, establish clusters that allow a definition of more
suitable base impact factors, considering the specificities of the distribution systems.
To test the proposed methodology, real data from a concessionaire of the Brazilian
electrical system was used. Nineteen substation bars were monitored through power quality
meters.
The methodology presented is generic and can be applied in any distribution system in
Brazil, or even in other countries that may adopt an index similar to the impact factor.
The results obtained in the case study showed that with the selected variables and the
formed groups, it was possible to establish different base impact factors for each distribution
system, which take into account the performance of similar systems.
The application of the methodology brings benefits to the electricity sector, especially
for consumers who have loads that are sensitive to short-term voltage variations, since it
establishes basic impact factors that promote the improvement of the power quality.
